Okay, I see your point, you clearly see Zoroark as deserving over Victini which is fine since it's your opinion, anyway if you check out that link I gave youvthat should pretty much tell you how unique Victini would be over a potential Zoroark who might manipulate sone of the same core features that Lucario or/and Mewtwo had.
*coughshadowballcoughcough*
Anyway, as far as relevence goes sure that's not the only deciding factor, clearly there are other factors to be considered as well such as popularity, exposure and of course Sakurai's interest, hell if Sakurai wanted Meowth for SSB4 he could very much put him in if he wanted to, I'm not actually saying that Meowth will get a spot but if Sakurai's interest is leaning towards it then we can pretty much see it happening regardless of the fans or not.
*coughcoughfurriescough*